Article published In:
ITL - International Journal of Applied LinguisticsVol. 6 (1969) ► pp.3–10
Automatic “Generating” of The Principal Tenses of English Verbs
References
W. Martin
: A Reverse Frequency-Index of Dutch, with an investigation into the lexical real frequencies of adjectival suffixes. I.T.L. 21 (Louvain 1968), pp. 45–62. 
H. Brandt Corstius